Fair Value Measurements (Narrative) (Details) (Fair Value, Measurements, Nonrecurring [Member], USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 14, 2014	Jun. 15, 2013	Jun. 14, 2014	Jun. 15, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying value of long-lived assets which were impaired during the period	$ 24.8	$ 10.0	$ 34.5	$ 30.0
Impairment charge	18.4	3.7	25.9	15.3
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of long-lived assets which were impaired during the period	$ 6.4	$ 6.3	$ 8.6	$ 14.7